Details
| Original language | English |
|---|---|
| Pages (from-to) | 286-291 |
| Number of pages | 6 |
| Journal | TERRA NOVA |
| Volume | 17 |
| Issue number | 3 |
| Early online date | 23 May 2005 |
| Publication status | Published - Jun 2005 |
Abstract
We studied more than 60 oceanic gabbros from the recent oceanic crust and from ophiolites (East Pacific Rise, Mid-Atlantic Ridge, Southwest Indian Ridge, Oman ophiolite) by scanning electron microscopy and found in nearly all samples microstructures suggesting that hydrous partial melting reactions proceeded. The characteristic paragenesis consists of orthopyroxene and pargasite rimming olivine and clinopyroxene primocrysts in intimate contact with neoblastic plagioclase strongly enriched in anorthite. This is in agreement with recent water-saturated melting experiments on a variety of natural gabbros between 900 and 1000 °C. The observed microtextures in the natural gabbros imply the propagation of water-rich fluids on grain boundaries in a ductile regime causing hydrous partial melting. Thus, this type of hydrothermal activity proceeds within the deep oceanic crust at very high temperatures (900-1000 °C) without a crack system, a prerequisite in current models for enabling hydrothermal circulation.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
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In: TERRA NOVA, Vol. 17, No. 3, 06.2005, p. 286-291.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Hydrous partial melting within the lower oceanic crust
AU - Koepke, Juergen
AU - Feig, Sandrin T.
AU - Snow, Jonathan
PY - 2005/6
Y1 - 2005/6
N2 - We studied more than 60 oceanic gabbros from the recent oceanic crust and from ophiolites (East Pacific Rise, Mid-Atlantic Ridge, Southwest Indian Ridge, Oman ophiolite) by scanning electron microscopy and found in nearly all samples microstructures suggesting that hydrous partial melting reactions proceeded. The characteristic paragenesis consists of orthopyroxene and pargasite rimming olivine and clinopyroxene primocrysts in intimate contact with neoblastic plagioclase strongly enriched in anorthite. This is in agreement with recent water-saturated melting experiments on a variety of natural gabbros between 900 and 1000 °C. The observed microtextures in the natural gabbros imply the propagation of water-rich fluids on grain boundaries in a ductile regime causing hydrous partial melting. Thus, this type of hydrothermal activity proceeds within the deep oceanic crust at very high temperatures (900-1000 °C) without a crack system, a prerequisite in current models for enabling hydrothermal circulation.
AB - We studied more than 60 oceanic gabbros from the recent oceanic crust and from ophiolites (East Pacific Rise, Mid-Atlantic Ridge, Southwest Indian Ridge, Oman ophiolite) by scanning electron microscopy and found in nearly all samples microstructures suggesting that hydrous partial melting reactions proceeded. The characteristic paragenesis consists of orthopyroxene and pargasite rimming olivine and clinopyroxene primocrysts in intimate contact with neoblastic plagioclase strongly enriched in anorthite. This is in agreement with recent water-saturated melting experiments on a variety of natural gabbros between 900 and 1000 °C. The observed microtextures in the natural gabbros imply the propagation of water-rich fluids on grain boundaries in a ductile regime causing hydrous partial melting. Thus, this type of hydrothermal activity proceeds within the deep oceanic crust at very high temperatures (900-1000 °C) without a crack system, a prerequisite in current models for enabling hydrothermal circulation.
UR - http://www.scopus.com/inward/record.url?scp=20844445476&partnerID=8YFLogxK
U2 - 10.1111/j.1365-3121.2005.00613.x
DO - 10.1111/j.1365-3121.2005.00613.x
M3 - Article
AN - SCOPUS:20844445476
VL - 17
SP - 286
EP - 291
JO - TERRA NOVA
JF - TERRA NOVA
SN - 0954-4879
IS - 3
ER -